The article "The Crisis in Socialist Theory: The 'Group of International Communists' in Holland." In: Southern Advocate for Workers’ Councils. An international digest. Formerly the "Southern Socialist International Digest", Melbourne, No 40, December 1947, p. 7-8. First published in Left, No 132, October 1947, p. 225-228. Bibliographic details from http://aaap.be/Pages/Pannekoek-Inventory.html.